<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>03_CSS常用值</title>
    <style>
        h1{
            color: red;/*单词表示法*/
            /*rgb表示法：red green blue,取值范围[0,255]*/
            color: rgb(255,0,0);
            color: rgb(0,255,255);
            color: rgb(0,255,0);
            color: rgb(255,0,255);
            color: rgb(0,0,255);
            color: rgb(255,255,0);
            color: rgb(255,255,255);
            color: rgb(128,128,128);
            color: rgb(0,0,0);
            /*十六进制表示法：#rrggbb,rr gg bb分别表示red green blue,取值范围[00,ff]*/
            color: #ff0000;
            color: #00ff00;
            color: #0000ff;
            color: #ffffff;
            color: #000000;
            color: #808080;
        }
        /*rgba表示法：red green blue alpha,alpha表示不透明度,取值范围[0,1]*/
        div{
            width: 100px;
            height: 100px;
            border: 3px solid #000;
        }
        .d1{
            background-color: rgba(255,0,0,1);
        }
        .d2{
            background-color: rgba(255,0,0,0.7);
        }
        .d3{
            background-color: rgba(255,0,0,0.4);
        }
        .d4{
            background-color: rgba(255,0,0,0.2);
        }
        .d5{
            background-color: rgba(255,0,0,0);
        }
        #bgi{
            width: 500px;
            height: 500px;
            border: 2px solid #000;
            /*background-image: url('../day01/img/2.png');*/
            /*背景处理：渐变(角度，颜色1，颜色2...)
            如果要写角度，角度值必须在第一个，单位是deg 270deg=-90deg*/
            background-image: linear-gradient(130deg,red,cyan);
        }
        #viewport{
            background-color: yellow;
            width: 500px;
            height: 300px;
            width: 100vw;/*100%的视口宽度，撑满全屏*/
            height: 100vh;/*100%的视口高度，撑满全屏*/
        }
    </style>
</head>
<body>
    <h1>测试色值</h1>
    <div class="d1"></div>
    <div class="d2"></div>
    <div class="d3"></div>
    <div class="d4"></div>
    <div class="d5"></div>
    <div id="bgi"></div>
<!--    <div>-->
<!--        <img src="../day01/img/2.png">-->
<!--    </div>-->
    <div id="viewport"></div>
</body>
</html>